How 'ping' command can be made useful to a Common person other than a network specialist while working with interconnected systems in a network ?

it can be considered as a first step in troubleshooting before going further to determine if we gonna need a technical support help or not.

ping  is useful to verify that the other device on the network is connected and ready for send and recieving the order from other devices 

  and useful to make sure all the data is recieved  by the other devices wilth the full packets of data

Defintely , if you knmow IP address of any network, you can ping that IP to see  whether you can reach,  for  example  you can also ping by domain name  for  ex ping www.Name of the Company.com etc , this will work in many situation where the DNS ( Domain Name Server) resolve the name to its IP address, if not you can ping by the  IP address. its the basic test for connectivity.

When a computer does not work first this to check the power, similarly when network does not work first step is to ping. However certain IP address you can not ping as firewalls in the network might block this ping command to work. you could  try  ping  yahoo.com  and ping  google.com and see the respose even come with their IP address as below,

ping yahoo.com

Pinging yahoo.com [98.138.253.109] with32 bytes of data:Reply from98.138.253.109: bytes=32 time=87ms TTL=50Reply from98.138.253.109: bytes=32 time=96ms TTL=50

Hope you got it clear

Ping is very usefull tool for network admin even it is usefull for comman person if he/she know how to use.

Ping is  a testing tool which is found in all operating systems, so its main function is to test network connectivity between to interconnecting devices by sending ICMP messages to the other devices.

Ping is  a testing tool which is found in all operating systems, so its main function is to test network connectivity between to interconnecting devices by sending ICMP messages to the other devices.

Most ping tools use Internet Control Message Protocol(ICMP). They send request messages to a target network address at periodic intervals and measure the time it takes for a response message to arrive.

Please define "Common Person". If you mean a regular user, he/she do not care about maintaining networks or systems.

Ping works like echo you ping an address and it replies back with a response.

Take a look at this article:

http://en.wikipedia.org/wiki/Ping_(networking_utility)